/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionSkyAtmosphereLightIlluminance.h
class UMaterialExpressionSkyAtmosphereLightIlluminance : public [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression)
int32
LightIndex
Indexof the atmosphere light to sample.
FExpressionInpu...
WorldPosition
World position of the sample. If not specified, the pixel world position will be used.